system output honesty [RE-wrenches]

[William Miller]

Friends:

With dual SW inverters (I believe, if memory serves me right) I finally
discovered that adjusting the float voltage until they both sell more or
less equally does the job of balancing.

William






At 05:04 PM 9/25/01 -0700, you wrote:
>Jeff C.,
>
>It is less important with a small array, but it still will work slightly
>better. The much bigger issue with dual inverters in sell mode is that they
>don't behave nicely with each other (they don't know how to share). One
>inverter invariably wins the conversion battle and the other inverter sits
>idle, or more likely, starts drawing power from the grid to fight the other
>inverter.
>
>I have yet to see a dual SW system on the grid the worked really well. You
>can trick them into working with various settings. I have a set of settings
>that has worked well for me, others on the list may have their own methods.
>If people are interested, we can do this onlist. If not, email me and I'll
>send them offlist.
>
>Bill.
>
>
>
>> -----Original Message-----
>> From: Jeff Clearwater [mailto:clrwater at earthlink.net]
>> Sent: Tuesday, September 25, 2001 12:02 PM
>> To: RE-wrenches at topica.com
>> Subject: RE: system output honesty [RE-wrenches]
>>
>>
>> Hi Bill,
>>
>> Does this apply to 1500 Watts going into two SW5548s in Sell back?
>> Or is it only important with some threshold percentage of input/rated
>> wattage?
>>
>> Thanks for this!
>>
>> Jeff C.
>>
>>
>> >The tech menu is the third level (go to menu 20, then push the
>> red and green
>> >buttons). Go to menu 22 (Sync) and then push the down menu arrow
>> until you
>> >get to "Set PWM Angle". The factory default is 129---push the down arrow
>> >until it reads 126 (minimum setting). Then make sure you return
>> the unit to
>> >meters (or wherever you leave it) so that the owner doesn't screw up the
>> >settings.
>> >
>> >I make no guarantees on whether or not the unit will blow up in your face
>> >(just kidding), but if you try this out on a good size array (3-5 kWstc)
>> >during the middle of the day, you will see a very pronounced reduction in
>> >heat of the SW unit.
>> >
>> >The first time I did this on my unit, the inverter was producing
>> 2000 Watts
>> >AC but was sloshing around 3000 Volt-amps AC. The fans were running full
>> >blast, the unit was burning hot to the touch which caused me to
>> inquire what
>> >the problem was. After finally getting hold of the SW designer and
>> >describing what I was seeing on the oscilloscope, he suggested the above
>> >fix. After doing this, the volt-amps dropped dramatically and the unit
>> >cooled down and the fans started cycling. It would be a miracle for the
>> >efficiency of the unit to be above 80% under the unadjusted condition.
>> --
>> ~~~~~~~~~~~~~~~~~~~
>> Jeff Clearwater
>> Ecovillage Design Associates
>> 2525 Arapahoe Ave, Suite E4, #280
>> Boulder, CO 80302
>> Community and Village Scale Renewable Energy Systems
>> 303-546-0460, clrwater at earthlink.net
>>
>> Council Member - Ecovillage Network of the Americas
>> http://www.gaia.org/secretariats/ena/
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
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>>
>
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__________________________________________________________________
William Miller
SLO Communications: Communications and Power Systems Consulting
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email: wrmiller at slonet.org
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